Shoe sole pressure device



Dec. 28, 1948; S'PLAWKER 2,457,720

SHOE SOLE PRESSURE DEVICE Filed Aug; 15, 1946 r 2 Sheets-Sheet 1 27 INVENTOR. SHMUEL PLHWKEQ Dec. 28, 1948. s. PLAWKER 2,457,720

SHOE SOLE PRESSURE DEVICE Filed Aug. 15, 1946 2 Sheets-Sheet 2 Patented Dec. 28, 1948 UNITED, STATES snoE sou}; PRESSURE-"DEVICE SamuelPlawker', Newark, N. J Application August is, 1946,-S erial No, 690,691

This invention relates to shoe sole pressure applying devices and in particular to one that will apply a constant uniform pressure to the sole of a shoe in cementing operations. i

In shoe manufacturing, at the present time, where advantage is being taken of the new plastic cements for securing an outer sole in place on the shoe, the problem of putting the sole under pressure until the plastic adhesive dries orhardens requires that the sole be pressed with an even pressure throughout the area thereof against the inner sole to which it is applied. The inner sole is sewn to the edges of the upper and then the lower or outer sole is cemented to the inner f'sole so that it closely adheres thereto and provides a waterproof sole structure that'has not been obtainabl in shoes, the soles of which have been sewn all the way through.

The important object of my invention, therefore is to provide a pressure device into which the shoe to be finally soled can be quickly placed and to provide a device wherein an even pressure will be applied all over the outer surface of the outer sole so that the connecting adhesive will be spread by the pressure to provide an even cementitious joining agent that will effectively bond the soles together without attention on the part .of the operator.

Another important object of the invention is to provide a device for applying pressure which can be mounted on a work bench or a wheel so that in quantity production, each device comes tofposition before the worker who can quickly remove the finished shoe and insert one to be cemented with a minium of effort and time.

A still further object of the invention is to provide a pressure device in which an elastic sheet is used so that when the shoe is placed thereon and pressure applied, the pliable sheet will autoinatically conform in shape to the shape of the bottom of the last on which the shoe is held so that not only even cementing will be the result, but the outer sole will be pressed into shape to conform closely to the shape of the last and the application of even constant pressure will cause the outer sole to conform to the proper shape and be bonded by a uniform thickness of cement or plastic adhesive material which when hard secures the soles together and provides a Waterproof structure that will retain its shape under all atmospheric conditions. v

With these and other objects in view, the invention comprises certain constructions hereinafter described and then particularly pointed out in the claims and a preferred embodimentof my 3 Claims. (01. ra- 33) invention is illustrated in the accompanying drawing, in which:

Figure 1 is a view in side elevation of the pressure applying holder showing several operating positions thereof in outline,

Figure 2 is a view inend elevation of the holder shown in Figure 1 and a part thereof being broken away to show the interior construction,

Figure 3 is an enlarged section on the line 33 of Figure 1 showing the conformation of the elastic sheet used in applying pressure to the shoe, i H

I V Figure is an enlarged fragmentary longitudinal section showing the conformation of the sheet in lengthwise engagement with the sole of the shoe,-' i

Figure 5 is a view similar to Figure 1 showing another form of the invention,

- Figure 6 is a section on the line 66 of Figure 5 showing the parts in elevation,

Figure 'l is a side view of a shoe in which another form of last is used,

Figure 8 is ,a plan View of the last shown in Figure 5,

I Figure 9 is a plan view of the last shown in Figure 7,

Figure 10 is a view in cross section through a last and blanket, and

Figure 11 is a view similar to Figure 10 showing the relation ofthe blanket and the last under pressure.

Referring to the drawing in detail, l0 indicates a'shoe having the usual upper II, to which is secured by sewing l2 an inner sole l 3 to which an outer sole I4 is to be attached, by the use of a plastic cement. Inasmuch as the invention is practiced" in manufacture or repair of shoes, a last I5 is employed, about the under surface of which the sole structure is shaped and pressure in a downward'direc'tion is exerted on the upper ridged edge [6 of the last by a pressure yoke IT. The latter is supported on a cross rod 3 which is mounted for rocking movement between the upper ends of sidearms I9. The arms H] are pivoted as at 20 to slotted guide strips 2|, in the slots 22 of which operate the guide pins 23 that project from the opposite sides of a cup 24.

j The cup is formed to present on its upper-edge an annular flange 25, the shape of which lonof pliable or elastic material, preferably rubber,

is secured by rivets or other fasteners 21 to the flange 25 to form aclosure at the top of the cup and a rest upon which the shoe to be placed under pressure is positioned as shown in Figure 1.

The bottom of the cup 24 is shaped internally to provide a central sleeve 28, and spring seats 29 in the corners thereof. The latter receive the upper ends of compression springs 30 which are supported in suitable pockets 3| in the upper surface of a base 32 and in turn, yieldably support the cup ,24 in spaced relation with and abovesaid base. The upward movement of the cup 24 under influence of said springs is limited by engagement of pins 23 in the upper ends of the slots 22.

The cup is lowered against the resistance of the springs by a draw rod 33 which is pinned to the sleeve 28 and depends from the underside:

cured thereto a stop collar 34 which alsolimits:

the rising movement of v the cup. Operation of the rod 33 may be provided in different, ways. Shouldbase 32 be .mounte'dupon a-moving'mem ber, such as a wheel, the rod 33 canbeprovided witha cam roller 35'-f0r engagement with-acam 36t'o pull therod 33 downwardly andlower the cup 24. If the base is mounted-upona bench; the rod may be extended as at'3-T- to be actuated by a foot lever 38.

When the outer surface of the-inner" solehas been covered with a plastic cement and theouter sole l4is applied,-theshoe is placed inthe" holder; the cup having first been pulled down as indicated in. outline in Figure 1, against the resist ance of the springs. The" arms I9 are then swung to a position above the-lastso that thepressure yoke ll is positioned thereover: The yoke is actuated by a handle 39 to engage-the upper-edge of'the last i 5 as-the cup is allowed to rise by operation of'rod 33: The forceex er-tedby the springs will cause the elastic sheet 26 to engage the bottom-of the-shoe withzpre'ssure to closely conform in. shape to-the shap'e ofs'the bottom of the last to cause the outersole to be shaped to the last andto-beevenly-"cemented at all points in. its area to the inner sole which al'soclosely conforms in: shape: to the bottom: of the last. The force constantly and uniformly. applied: by the springs and transmitted; to; the sole of the shoe by the sheet 011-. blankehmember. will. cause the latter to engage the outer: sole with an even: pressureat all points: and'lthe; plifable nature of the sheet and its elastioitywill.- augment' the pressure. applied by. thesprings.

In the foregoing description. I haveindicated attachment of the-sole throughout its.area-,,-buti this is only employed. in the making of heavy. ski shoes where stiffness of. the sole and water.-- proofing is essential. My improvement isprefer-sably applied not only to sole lay-ingf but. also; to sole cementing where; the soleis glued or. otherwise secured to the upper abouttheperiph eral. edges of each. Asshown in Figure 6, the.

outer sole 40 is cemented atitsmarginaledge to. the inturned-edge of theupper 4i; toprovidethe.

waterproof structure and at the. same. time. retain flexibility of the sole inthe uncement'edpontion. thereof.

The bottom contour of the last. variesin.

uneven distribution of the cementing agent and unequal binding pressures, all of which are objectionable. By my novel limp blanket 42, the weight of the last and shoe will cause the blanket to conform to the shape of the sole and last and cementing pressure applied thereafter Will be evenly distributed over the entire area of the sole. The use of the machine for sole laying is a-..feature.and-where cementing is not to be performed; the pressure. can be used to shape the sole to the last so that said sole will closely ,conform to the bottom contour of the last and thus produce a sole shaped to the foot of the wearer;

In.-.the..for.m of the invention shown in Figures 5 and 6, the cup 43 is guided by the pins 44 in slotted guide plates 45, the upper edge of one of Whichisnotched as at 46 to detachably retain the side arms 41 in the outline position shown in Figure 5, by a gravity latch pin. 55, to permit a shoe being placedin position for. work on the cup. In this instance'pressure is applied to the entire sole 40' of the shoe 48,,in which the last 49 is,positioned, by a self-seating bridge piece 50 having end seat extensions 5| for engagement with the heeland vamp portions of av last and shoe respectively, so that pressure can be applied*longitudinally of "the shoe. The upper edge of'the bridge 50'is shaped to provide a yoke looking seat 52510, that looking movement of the yoke 53; may be limited. The yoke is pivoted on a cross bar 54* fixed'in the side arms 41 and is released'for. pivotal'action by release of the handle screwx55A. For use in half. sole cementing or shapinaa last having a pressure sole part 6i and a pressure. bar 62 is used as shown in Figure "7.

The, bar 62 isengaged by the yoke 55' to apply pressure as needed. The top shape of'the cup may be varied to fit the type of shoe being worked'upon. In" Figures 10 and 11 the member 63 is indicative of'a combined last and shoe to show. how theblanket 42, being flexible or pliable,,willautomatically conform to the shapev of the sole and the last to engage the same. evenly under pressure in cementing or sole laying operations. into the bottom of the cup 43 for pulling the latt'er down against the, resistance of the springs.

My invention is not to be restricted to the precise details of construction shown since various changes and modifications may be made therein without departing from the scope of the invention or sacrificing the advantages to be derived from its use.

Whatrl claim' is:

1. In a: shoe sole pressure device, in combination; a hollow cup;.a, pliable covering across the t'opof saidcup'constituting a support for a shoe, a basesprings for. yieldably'mounting said cup on the base, side arms pivoted to said base and swingable over'said'shoe, a bridge piece for en.- gaging'a lasted shoe at the'front and rear portions'thereof, a" yoke supported in said arms and movable to engage the" bridge to apply pressure to" the last shoe against the resistance of said springs Wherebysaid" covering engages and conforms the sole' of the shoe closely, to the shape of" the last, and" latching means for releasably holding the sidearms in an inoperative position.

2. In a shoe sole pressure device, in combination, a hollow cup, a pliable covering across the top ofsaid cup and constituting a support for a shoe, a base; springs for yieldably mounting said cup on the base, side arms pivoted to said The rod'65' may be threaded as at 66' base and swingable over said shoe, a bridge piece for engaging a lasted shoe at the front and rear portions thereof, a yoke supported in said arms and movable to engage the bridge to apply pressure to the lasted shoe against the resistance of said springs whereby said covering engages and conforms the sole of the shoe closely to the shape of the last, a rod depending from said cup for pulling the cup down against the resistance of said springs whereby said yoke may be positioned preparatory for bridge engagement when the cup rises.

3. In a shoe sole pressure device as set forth in Claim 1 including slotted plates adjacent said side arms, and projections on the cup for engagement with said slots to guide the cup in vertical movement.

SAMUEL PLAWKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,727,519 Peterson Sept. 10, 1929 1,777,676 Pelletier Oct. '7, 1930 FOREIGN PATENTS Number Country Date 385,273 Germany Nov. 20, 1923 441,496 Great Britain Jan. 20, 1936 673,736 France Oct. 14, 1929 

